{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-74616",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-74616"
  ],
  "published": "2026-08-22T15:32:12Z",
  "summary": "xdp: reject clones that overrun skb_shared_info tailroom",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxdp: reject clones that overrun skb_shared_info tailroom\n\nxdpf_clone() clones broadcast copies into a single page and sets\nframe_sz to PAGE_SIZE. __xdp_build_skb_from_frame() later treats that\npage like a normal XDP frame and expects the usual skb_shared_info\ntailroom at the end of the buffer.\n\nThe current check only rejects frames whose linear xdp_frame header,\nheadroom, and packet data exceed PAGE_SIZE. A source frame backed by a\nlarger allocation can still satisfy that check while extending into the\nclone's required shared-info area. When such a clone is converted back\ninto an skb, build_skb_around() places skb_shared_info over live packet\nbytes and later writes can corrupt XDP return metadata.\n\nReject clones unless their linear area fits inside\nSKB_WITH_OVERHEAD(PAGE_SIZE), matching the tailroom requirement already\nenforced by the XDP-to-skb conversion path.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          },
          "1:6.18.33-1+rpt1": {
            "linux_commit": "95b85bebbedcaedfa7ca79116ed38b7376fba412",
            "upstream_version": "6.18.33",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
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            "upstream_version": "6.18.34",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
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            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.18.45"
          }
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      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-74616"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/58408982fa39f9758124cec169f42854d6f98f35"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/685edea27ac68d08fe4dbd3de74b858d2ad8e830"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ba13763d667e008e185fedf592d53846a5b457d1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ef4b7c7046d29a67090de15af0da0d1ae8d1b192"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/fab820f1691a9e26d9031f18aae1e9ce09078f92"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/f463b6f4957c9c3fd1c75f8d3e5af4879fa609c0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/e48e8edbef2eb824201495daa5234560f632b23c"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-25T05:42:41Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 9.8,
      "cvss_v3_severity": "Critical",
      "scenario": "AV:N - Remote packets on an XDP ingress netdev whose program calls bpf_xdp_redirect_map() with BPF_F_BROADCAST reach xdpf_clone() through dev_map_enqueue_multi(); edge L4 load balancers and container fan-out to veth peers are common deployments where cloned frames later hit __xdp_build_skb_from_frame() without any local attacker access.\nAC:L - Once broadcast devmap redirect is deployed, an attacker can reliably craft linear frames whose headroom plus payload fall in the SKB_WITH_OVERHEAD(PAGE_SIZE)..PAGE_SIZE window; no race, timing luck, or uncontrollable memory layout is required and the condition can be retried with each packet.\nPR:N - Loading/attaching the XDP program and populating the devmap requires CAP_BPF and CAP_NET_ADMIN on the host, but an unauthenticated remote sender on the already-configured datapath needs no privileges on the victim system, matching the CNA pattern used for the related devmap broadcast clone issue CVE-2026-64355.\nUI:N - Exploitation is driven entirely by network traffic processed in NAPI/softirq after XDP redirect; no victim mount, file open, or other interactive action is required beyond packets reaching the configured interface.\nS:U - The flaw corrupts skb_shared_info placement and metadata within the host kernel address space during skb construction; it does not inherently cross VM, hypervisor, or IOMMU security boundaries.\nC:H - build_skb_around() places skb_shared_info over live packet bytes and memset initializes it there; subsequent skb/shinfo access can read kernel metadata and adjacent buffer contents beyond intended bounds, constituting exploitable out-of-bounds memory disclosure.\nI:H - Overlapping skb_shared_info tailroom lets kernel writes corrupt packet data and lets attacker-influenced bytes corrupt shinfo fields used by later stack, GRO, and transmit paths, giving an out-of-bounds write primitive over frame metadata.\nA:H - Tailroom overlap during __xdp_build_skb_from_frame() can fault or corrupt state during skb construction and downstream processing, producing kernel oops/panic; an attacker can trigger this repeatedly with crafted packets on the broadcast redirect path."
    }
  }
}